Re: jsonb and nested hstore

On 02/28/2014 07:19 AM, Thom Brown wrote:

On 28 February 2014 08:12, Andres Freund <andres@2ndquadrant.com <mailto:andres@2ndquadrant.com>> wrote:

    On 2014-02-27 15:06:33 -0500, Andrew Dunstan wrote:
    > You realize that this API dates from 9.3 and has been used in
    numerous
    > extensions, right? So the names are pretty well fixed, for good
    or ill.

    Sure. Doesn't prevent adding a couple more comments tho. I've only
    noticed this because I opened the header as a reference when reading
    your patch. Anyway, do something based on that feedback or not, your
    choice ;)


Can I ask why I can do this:

SELECT review %> 'product'->'title' as product_title
FROM rating;

But I can't do this:

SELECT review->'product'->'title' as product_title
FROM rating;

ERROR:  operator does not exist: hstore -> hstore
LINE 1: explain select review -> 'product'::hstore ->'title' as prod...

Yet I can do this:

SELECT review::json->'product'->'title' as product_title
FROM rating;

I don't think this complaint has anything to do with the text you quoted, so you've kinda hijacked the thread slightly.

But anyway, I think we've seen enough of these to conclude that the casts from hstore to jsonb and back should not be implicit. I am fairly confident that changing that would fix your complaint and the similar one that Peter Geoghegan had.